burridge



L. s. BURRIDGE, pw'g r. o. uumunez. EXECUTDR TYPE WRITING MACHINE.

APPLICATION mm mm: 13, ma. nzuiwin APII.

2 SHEETS-SHEET l- INVENTOFU 4% AT RN EY.

Patented Nov. 25, 1919.

7W W BY L. S. BURRIDGE, DEC'D. r. 0. BURRIDGE. ixicuron.

TYPE WRHING MACHINE. arrucmou mm mu: :3, ma. nzuswzn mi. 1. ms;

Patented Nov. 25, 1919.

2 SHEETS-4'12 2.

INVENTOR- W W 320mm.

WITNESSES:

UNITED STATES PATENT OFFICE.

LEE S. BUB-RIDGE, DECEASED, LATE OF NEW YORK,

.Y., BY FRANCIS O. BURBIDGE,

EXECUTOR, OF NEW YORK, N. Y., ASSIGNOR, BY MESNE ASSIGNMENTS, TO UNDER- WOOD TYPEVRITER COMPANY, OF NEW YORK, N. Y., ADORPOBATION OF DELA- WARE.

TYPE-WRITING MACHINE.

Specification of Letters Patent.

Paw-awed Nov. 25. 1919.

Application filed June 13, 1918, Serial No. 239,796. Renewed April 7, 1919. Serial No. 288,378.

To all whom it may concern Be it known that loan S. llumuoon, dcceased, lute u citizen of the. United States, and late residing in the borough of Mnuhuttnn, county, city, and State of New York, invented certain new and useful Improvements in 'iypc-Writing Machines, of which the following is :1 specification.

This invention relates to typewritiug um rhines, and is herein disclosed as applied to a small, portable typcwriting umvhine which shall incorporate suhsfui'itinlly all of the ad vantages of larger nmchinos, and yet, at the some time, may he vary light: To Iflillifi such u machine durable uud practical, it is essential that the parts shall lic not. only light, but rigid, and that the weight of the machine shall be concentrated us for as possible at the point'wlierc it is most efl'cctivc, viz., largely in the neighborhood of the our; ria 'c, to absorb the shock of its arrest. by f-lw esczpcment mechanism. 3

One serious diiliculty in the designing of such machines, of the visible writing type, is hat the typobnrs have to be supported upon a rigidly held scgmenl which stiuuls in front of the platen, and which must b: sup )orted in such :1 way a. not in interferu with tho sliiftmerriugo of the machine, or with any part oi um traveling carriage. liloreover, the mnnoctions between the keylevers and the type-bore put a very ronsidernble'stmin upon the segment and upon the points of support of such connections.

According to the present invention, the segment may form part of a substantially triangular or tripodal structure sot in the muin frame of a typewriter, said triangle advantageously having its bottom forn'iing a fulcrum-point for the connections between the'key-lcvcrs and the type bnrs.

The segment forms a truncated top for the triangle, instead of a true apex therefor, and the segment may lhcrcfore be further supported by a girder nnchorcrl in the bottom member of the Triangle. and also onchored in the frame of the muchino at one or more other points. To obtain the requisite lightness, this girdov may be in the form of a thin, flat pinto, so it may be easily stamped out of shwmuctal. The other parts of the triunglv may ho formod of sheet-metal member; having one or more turnedmp edges, thus enabling said momnections to the type-burs. By having, the

aforesaid girder made out of sheet-meta], it is possible to out it out in such a way that it r-Ieurs all moving parts with which it might lIltUIfUl'G, and yet possesses great strength in the plane of its surface.

Other futuros and advantages will hereinafter appear.

in the accompanying drawings,

Figural ardiugrummutic sectionulsidc vicw of n lzype writlng machine, embod inn, the pizselff invention. This view for c eurness shows a central type-bar, but other parts to tho left of the center are also shown.

Fig. 2 is a perspective, side view of the central stiffening girder.

Fig. 3 is o plan view of the machine, illustrating the segment-supporting structure and certain cooperating parts, with most of the other mechanism removed.

In the machine herein disclosed, keys 1 arc mounted on the front ends of levers 2, pivoted at their rear ends in a late 3, which is illustrated as a segment, Fig. 3. Whenever u. key 1 is depressed, a cam-follower 4 upon the lever carries down a. double cam 5, which is pivoted at 6 on a bracket 7, so that a bell-crank-arm 8, fast to the cam 5, will swing forwardly, drawing downwardly forward a link 9, which is pivotally attnched to a type-bar 10, thus swinging said type-bar upwardly and rearwardly against ihe front side of a platen 11, with the result that a type 12 on the type-bar will print against the platen.

The link 9 is connected to the type-bar 10 by a pivot 13, well behind the hangerpivot 14, on which the type-bar swings, so that the link 9 is pulled almost forwardly during the swing of the type-bar. The hunger-pivot 14 is in the form of a curved rod, passing through openings 15 in ears 16 of a solid metal segment 17. This segment is inclined reurwardly at an angle of about thirty drgrees, to enable the type-bars 10 to spread the types widely, so that a small segment will accommodate alarge number of type-bars, thus rendering it possible to reduce the size of the machine, and consequently its weight. The segment 17 has faces at its ends substantially radial to the curvature of the segment, and each end is held fast to a thin, metal channel-bar 18, extending downwardly toward the front of the machine from the segment, each chair nel-bar going to the corresponding side bar 19 of the machine, to which it is firmly held by a screw 20.

Each channel-bar 18 is firmly held to the corresponding face of the segment 17 b means of a screw 20" and other means, sue l as a dowel-pin 21. The ends of the channel-bars 18 are bent over, as clearly seen in Fig. 3, so that their lower ends lie flat against the faces of the adjacent side bars 19, and their lower ends may terminate flat against a tie-plate 22, which extends across the bottom of the machine, and to which the brackets 7 are screwed or riveted. The tie-plate 22 is shown in the form of an L-platc having a vertical web 23, and as having its fiat web 24 resting on the bottom flanges 25 of the side bars or plates 19,- these side plates being also in the form of L-plates. This structure, it will be observed, furnishes an extremely rigid connection for supporting the pivots 6 and the pivots 14 relatively to each other, thus enabling the reat tension of the links 9to be taken up wlthout putting any strain on the rest of the machine. It will be noted that to bring the channel-bars or plates 18 to the tie-plate 22, the channel-plates 18 are somewhat more nearly horizontal than the segment 17.

To give further rigidity of the mechanism, there is provided a girder 26, (see Fig. 2), which serves to further stiffen the mechanism. This girder 26 is held by screws 27 to the rear plate 28 of the n'iachine frame, which also is in the form of an L-plate firmly secured to the side plates 19. The girder 26 includes a U-shaped portion 29, in the opening of which lies a hollow shaft 30, forming part of the platen-shift mecha nism, the remainder of which latter may be substantially identical with that disclosed in application, Serial No. 52,594, filed September 27, 1915. In front of this U-shaped portion, the girder 26 is provided with a horizontal elbow 31, firmly secured or riveted at 33 to a transverse tie-plate 32, Fig. 3. This tie-plate is in the form of an L-plate, held by separated rivets or screws 34 to the bottom flanges 25 of the side p ate: 11), and comprising an up'w ardly-turned web 35. U 7011 this tie-plate32, the key-lever fulcrum-plate 3 is firmly supported: by being screwed against brackets 36, which in turn are firmly screwed or riveted to the bottom of the plate 32. The girder 26 may further support the fulcrum-plate 3, as by resting against it, with an arm 38.

Th girder 26 is also so constructed that it fu hishes ,a sup-port for the segment 17 and a connection between the segment and the tie-plate 22. For this purpose, the girder 26 has an upward extension 39 rising from in front of the elbow 31, said extension passing upwardly in front of the fulcrumlate 3 and having at its u per end two el ows 40, turned at right ang es in opposite directions from it, to which is screwed an S-shaped flat channel-plate 41, which extends in over the internal angular surface 42 of tie segment, and is there held by screws 43. From the elbows 40, the girder 26 extends forwardly and slightly downwardly (to kee well below the type-bars) to the front L-p ate 44- of the machine frame,

against which it bears, and to which it may be anchored by a screw 45 passin through the turned-over end 46 of the gir er.

The girder 25 is connected to the tie-plate 22 by a projection 47 unitary with the gir der and extendin vertically downwardly therefrom. To he (1 it firmly to the tie-plate 22, the projection 47 is provided with a turned-up elbow 48, which is screwed or riveted to the tielate 22 practically at the center of the mac ine, thus forming a firm connection between the center of said tieplate and the center of the segment, with the result that the strain formed by drawing on the links 9 at the center of the tie-plate is thus adequately cared for. In order to, give the girder 26 further strength, it is provided with a forwardly-extending lower portion 49 springing from the projection 39, said lower portion being curved downwardly at 50, to permit the insertion of an annular arched plate 51, across which the returningsprings 52 of the key-levers 2 are tensioned. The forwardly-extending portion 4,9 then curves upward at 53, clearing the connecting rod of the shift-mechanism (not shown) to 'oin the main portion of the girder.

The channel-bars 18 not on] serve to support the segment, but they a so serve to support the curved type-bar-rest 54, which is in the form of a flat bar having a front segmental portion, covered with an anti-1e hound cushion 55, and having ends 56 which extend almost straight rearwardly to the channel-bars 18, to which they are held b rivets or screws 57. The S-shapcd cha'nrle plate or bar 41 may be utilized as a steadying men'i'ncr for a type-guide 58, which may be in the form of an S-shaped member adapted to fit between the turned-u edges of the S-shaped channel-plate and e held in place by the screws 43, which pass not only through the channel-plate 41, but also through the type-guide 58.

Inasmuch as the segment is supported by the thin, fiat channehbars 18, the segmentsupports. furnish ample room for the ribbon-mechanism, disclosed in the above-menfront part 59 of the shift-frame,

tioned application, which is mounted on the which latter includes, as set forth in said application, the rear track 60 and the front track 61, on which the carria e travels. It also brings the support of t ese and, except for the thin girder 2.6, entirely in front, of the escapement mechanism, which includes the vibrating bar 62.

The escapement mechanism is operated as disclosed in the aforesaid .application, by means of a universal bar 63 underlying the key-levers 2, and pivoted. on cars 64 of the brackets 36. As disclosed in said application, the universal bar 63 is connected by a link 65 to a rocking member 66, 'ournaled in brackets 67, also mounted on t e tie-bar or rod 32, said rocking member 66 rocking in a slightly cut-away )ortion 68 of the girder 26. The universal bar (53 is tensioned upwardly by springs 69 anchored in the horizontal ends 56 of the type-supporting bar 54.

The space-bar 7 O is fast on a rock-shaft 71, journaied on brackets 7:2, extending horizontally from the lower web 24 of the tie-plate 22, and IS HOIIIIRlly held upward by a spring 73, also anchored in said plate. The spacebar 70 is connected by a link 74, extending from a rock-arm of the shaft 71, and vibrating a rock-arm 76, which supports one end of the vibrating bar The structure brings the heavy segment adjacent the carriage, thus giving inertia to the whole machine at that part. Substantially the remainder of the parts may be stamped of metal, so the whole machine is very light.

Variations may be resorted to within the scope of the invention, and portions of the improvements may be used Without others.

Having thus described the invention, I claim:

1. In a front-strike typewriting machine, the combination with a segment and a frame including bottom edge plates, of substantially radial ends for said segment, sup porting bars fast to said ends and extending to said bottom plates to support the segment therefrom, and a tie-plate extending from one bottom plate to the other adjacent to the ends of said bars.

In a front-strike typewriting machine, the combination with a segment and a frame including bottom edge plates. of substantially radial ends for said segment, supportin bars fast to said ends and extending to said bottom plates to support the segment therefrom, a back-bottom plate for said machine. and a girder extending from said back-bottom plate to the segment to support the latter.

3. In a fronbstrike typt-wrinnv the combination with a segment a including bottom edge plates; of

machine, frame subst anent entirely clear,

of the machine frame,

tiall radial ends for said segment, support- ,ing' are fast to said ends and extending to said bottom plates to support the segment therefrom, a back-bottom plate for said machine, a girder extending from said backbottom plate to the segment to support the latter, and a tie-plate extending from one bottom plate to the other adjacent to the ends of said bars.

4. In a. front-strike typewriting machine, the combination with a segment and a frame comprising bottom L-plates, of channel plates connecting said segment to said bottom plates, so that the segment and the lastnamed plates form a triangle, and a tieplate connecting the bottom plates adjacent the ends of the channel plates to complete the triangle.

In a front-strike typewriting machine, the combination with a segment and a frame con'iprising side bottom L-plates, of channel plates connecting said segment to said bottom plates, so that the segment and the lastnamed plates form a triangle, a tie-plate connecting the bottom plates adjacent the ends of the channel plates to complete the triangle, a back L-plate also forming part and a girder extending from said back L-plate to su port the segment and also extending to sai tie-plate and fast thereto.

6. In a front-strike typewriting machine, the combination with a segment and a frame comprising bottom L-plates, of channel plates connecting said segment to said bottom plates, so that the segment and the lastnamed plates 7 connectin the bottom plates adjacent the ends of t e channel plates to complete the triangle, a back L-plate also forming part of the machine frame, a girder extending from said back L-plate to support the segment and also extending to said tie-plate and fast thereto, type-bars mounted in said segment, levers journaled on said tie-plate, links connecting said type-bars and said levers, and keys forpperating said levers to draw said links to cause the types to print.

7. In a frontsstrike typewritin machine, the combination with a type writer frame and a segment inclined to the vertical, of bottom edge plates for said frame. and supporting bars extending from said segment and nearly parallel to its face and anchored. in said bottom plates.

8. In a front-strike typcwritiug machine, the combination with a segment lnclincd to the vertical and a typewriter frame, of bottom edge plates for said frame, supporting bars extending from said segment and nearly parallel to its face and anchored in said bottom plates, and a. tie-plate extending across said machine and connecting said bottom plates.

9. In a front-strike typewriting machine,

form a triangle, a tie-plate the combination with a segment inclined to the vertical and a typewriter frame, of bottom edge plates for said frame, supporting bars extending from said segment and nearly parallel to its face and anchored ill said bottom plates, a tie-plate, a backbottom plate for said machine, and a girder anchored in said back-bottom plate and said tie-plate and supporting said segment.

10. In a front-strike typewritmg machine, the combination with a segment inclined to the vertical and a typewriter frame, of bottom edge plates for said frame, supporting bars extending from said segment and nearly parallel to its face and anchored in said bottom plates, :1 tie-plate extending across said machine and connecting said bottom plates, a back-bottom plate for said machine, and a girder anchored in said backbottom plate and said tic-platc and supporting said segment.

11. In a front-strike typewriting machine, the combination with a baclcbottom L-platc, of side bottom L-platcs, afront plate, an L -tie plate extending between said side plates intermediate the front and back of the machine, a segment, channel plates rising from said side plates adjacent said tic-plate and united to the segment to form a triangular structure with the segment at the apex, and means for supporting said segment from the back L-plate.

12. In a front-strike typewriting machine, the combination with a segment and a frame for the typewriter, means for supporting said segment from the sides of the frame, a back plate, a girder extending from said back plate to the segment, an extension of the girder forming a channel plate by which it engages the segment, and a type-guide having a lower extension lying Within the channel platc adapted to form part of a locking means for locking the girder to the segn'ient.

13. In a front-strike typewriting machine, the combination with a segment, of plates supporting it from the sides of the machine, so that the segment forms substantially a triangle therewith, a girder extending for- \vaizlly and backwardly of the machine also supporting the segment, and means whereby lhc girder is supported both in front of and V bchind lhc segment.

14. In a. front-strike typewriting machine, the combination with a segmenflof plates support log it from the sides of the machine, so that the segment forms substantially a triangle therewith, a girder extending forwardlx and baclnvardly of the machine also supporting the segment, a support for said girder at the back of the machine, a tic-plate between the sides of the machine in which the girder is anchored. type-bars, operating devices for the type-bars mounted upon said tie-plate, and links connecting said operatmg devices ing devices and said type-bars for operating hem.

15. In a front-strike typewriting machine, the combination with a segment, of plates supporting it from the sides of the machine, so that the segment forms substantially a triangle therewith, a girder extending forwardly and backwardly of the machine also supporting the segment, a support for said girder at the back of the machine, a tieplate between the sides of the machine in which the girder is anchored, type-bars, operating devices for the type-bars mounted upon said tie-plate, links connecting said operating devices and said type-bars for operatin them, an extension of said girder in the rout of the machine, and a front plate of the frame adapted to support the girder at the front.

16. In a front-strike typewriting machine, the combination with a segment and a frame having bottom side plates and a back-bottom plate, of supports for said segment rising from said bottom plates, so that the segment forms the apex of a pyramid having its supports in the side plates and the back plate.

17. In a front-strike typewriting machine, the combination with a segment and a frame comprising side plates and a back plate, of supports for said segment extending to said side plates, :1 tie-plate extending across the machine between said supports, a girder for supporting said segment anchored in the rear plate, a second tie-plate extending across the machine to which the girder is anchored, key levers, a fulcrum for said key levers on said second-named tie-plate, type-bars journaled in the segment, operating devices for said type-bars on the first tie-plate, links extending from said operatto said type-bars, and connections from the key lovers to the operating devices.

18. In a front-strike typewriting machine, the combination with a-segment and a frame comprising side plates and a back plate, of supports for said segment extending to said side plates, a tie-plate extending across the machine between said supports, a girder for supporting said segment anchored in the rear plate, a second tie-plate extending across the machine to which the girder is anchored, key-levers, a fulcrum for said key-levers on said second-named tie-plate type-bars journaled in the segment, operat-' ing devices for said type-bars on the first tie-plate, links cxtemling from said operatingdevices to said type-bars, connections from the key-levers to the operating devices, and an escapement mechanism comprising vibrating parts mounted on and tensioncd from said second tie-plate.

19. In a typewriting machine, the combination with a frame, of a bottom cross bars mounted in said frame, keys mounted on key-levers, a fulcrum-plate for said keylevers "mounted on one of said cross-bars, a type-bar segment, type-bars pivoted in said segment, links for operating said typebars, levers operated by said key-levers for operating said links, supports for said operating levers mounted on the second cross-bar, means supporting said segment springing from'the second cross-bar, and a girder extending from one cross-bar to the other, also forming a support for said segment.

20. In a typewriting machine, the combination with a frame, of bottom cross-bars mounted in said frame, keys mounted on key-levers, a fulcrum-plate for said key-levers mounted on one of said cross-bars, a type-bar segment, type-bars pivoted in said segment, links for operating said type-bars, levers operated by said key-levers for operating said links, supports for said operating levers mounted on the second cross-oar, means supporting said segment springing from the second cross-bar, a girder extending from one cross-bar to the other, also forming a support for said segment, a traveling carriage, escapement mechanism for said carriage, and an operating device for said escapement mechanism including levers and spring means supported from said first cross-bar.

21. In a typewriting machine, the combination with a frame, of hottom CIOSS-btll'S mounted in said frame, keys mounted on key-levers,a fulcrum-plate for said keylevers mounted on one of said cross-bars, a type-bar segment, type-bars pivoted in said segment, links for operatin said type-bars, levers operated by said keyovers for operating said links. supports for said operating levers mounted on the second cross-bar,

meanssupportmg said segment springing from the second cross-bar, a girder extending from one 'bar to the other, also forming a support for said segment, L-plates forming the sides of the machine frame firmly attached to said cross-bars, and a back L-plate forming the rear of the machine.

22. In a typewriting machine, the combi nation with a frame, of bottom cross-bars mounted in said frame, keys mounted on key-levers, a fulcrum-plate for said keylevers mounted on one of said cross-bars, a type-bar segment, type-bars pivoted in said segment, links for operating said type-bars,

levers operated by said key-levers for operating said links, supports for said operating levers mounted on the seoond cross-bar, means supporting said segment springing from the second cross-bar, a irder extending from one cross-bar to t e other, also forming a support for said segment, a traveling carriage, cscapement mechanism for said carriage, an operating device for said escapement mechanism includin levers and spring means supported from said first crossbar, side L-plates forming the sides of the machine frame, to which said cross-bars are firmly attached, and a rear L-plate to which said girder is also attached.

In a typewriting machine, the combination with a frame, of bottom crossbars mounted in said frame, keys mounted on keylevers, a fulcrum-plate for said key-levers mounted on one of said cross-bars, a type-bar segment, type-bars pivoted in said segment, links for operating said type-bars, levers operated by said key-levers for operatin said links, supports for said operating evers mounted on porting said segment springing from the second cross-bar, a girder extending from one cross-bar to the other, also forming a support for said segment, and a universal bar al pivoted on said first cross-bar and adapted to be operated by the typewriter keys.

24. In a typewritlng machine, the combination with a frame, of bottom crossbars mounted in said frame, keys mounted on key-levers, a fulcrum-plate for said keyievers mounted on one of said eross bars, a type-bar segment, type-bars pivoted in said segment, links for operating said type-bars, levers operated by said key-levers for op erating said links, supports for said operating levers mounted on the second crossbar, means supporting said segment at the sides and springing from the second crossbar, a girder extending from one cross-bar to the other, also forming a support for said segment, a "niversal bar also pivoted on said first cross-bar and adapted to be operated by the typewriter keys, and a returning means for said universal bar anchored in said side segrnent-supportin means.

FRANCIS O. URRIDGE, Executor of the last will and testament of Lee S. Bud-ridge, deceased. Witnesses:

Nettle M. BROWN, Eorrn Pannosn.

the second cross-bar, means sup- 

